Android Studio - 尽管构建正常，但“无法解析符号"语法高亮显示错误 [英] Android Studio - 'Cannot resolve symbol' syntax highlighting errors although build is ok

问题描述

几天以来我遇到了一个非常烦人的问题，在我尝试从备份中恢复以前工作的 Android Studio 项目之后，在获得一台新计算机后.

我在 android.support.v7.app、android 等 Android 库中遇到无法解析符号" 语法高亮问题.support.v4.app 和 Google Play 服务，我已将其作为依赖项包含在内.但是，该项目构建良好，我可以在手机上毫无问题地运行该应用程序.

我已经验证了 SDK 安装下是否存在这些 jar 文件 - 例如\sdk\extras\android\m2repository\com\android\support\appcompat-v7\23.0.1".

我的问题与以下帖子中报告的问题非常相似:

1. 解决方案

   原因是我的项目路径中有一个 '!' 符号.显然，正如我现在了解到的，许多 Java 程序都因为这个原因而失败！:-)

   我刚刚重命名了路径，现在可以正常工作了 :-)

   <小时>

   附言

   感谢@gabriele-mariotti 的 gradlew clean 建议.事实上，这帮助我找到了真正的根本原因.由于 RuntimeException，我无法从终端运行 gradlew:

   无法确定包装版本.在 org.gradle.wrapper.GradleWrapperMain.wrapperVersion

   但这帮助我了解了 '!' 的效果路径上的符号，以及问题的根本原因.谢谢大家！

   I have a really annoying problem since several days, after I tried to restore a previously working Android Studio project from a backup, after getting a new computer.

   I have the "cannot resolve symbol" syntax highlighting problem with the classes from Android libraries such as android.support.v7.app, android.support.v4.app, and Google Play Services, which I have included as dependencies. But, the project builds fine and I can run the App on phone with no problems.

   I have verified whether these jar files exist under SDK installation - for e.g. "\sdk\extras\android\m2repository\com\android\support\appcompat-v7\23.0.1".

   My problem is quite similar to the ones reported in below posts:

   1. Android Studio says "cannot resolve symbol" but project compiles
   2. Android Studio cannot resolve symbol but code executes correctly
   3. Android Studio suddenly cannot resolve symbols

   I have tried all the solutions provided in various stackoverflow discussions (i.e. Sync Gradle Project, Invalidate Cache/Restart, Clean/Rebuild, Deleting gradle generated files (.gradle, build, .idea directories etc.), downgrade to lower API and upgrade etc. But, no method is helpful.

   I use Android Studio 1.3.2 and API 23. All build tools, support library etc. are up to date (tried with both v22.+ and v23.+ of the libraries).

   Please do help if you have any other suggestions!

   Extract from my build.gradle:

   apply plugin: 'com.android.application'
   android {
           compileSdkVersion 22
           buildToolsVersion '23.0.1'
   
   defaultConfig {
       applicationId "com.myapp.fun"
       minSdkVersion 22
       targetSdkVersion 23
       versionCode 1
       versionName "1.0"
   }
   buildTypes {
       release {
           minifyEnabled false
           proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
       }
   }
   }
   dependencies {
       compile fileTree(include: ['*.jar'], dir: 'libs')
       compile 'com.android.support:support-v4:22.+'
       compile 'com.android.support:appcompat-v7:22.+'
   }
   

   Screenshots of the problems can also be found below. I think Android Studio is not able to import the dependent libraries for syntax highlighting, although the compiler is able to include them and build successfully.

   Screenshot:

   解决方案

   The reason is because I had a '!' symbol in my project path. Apparently, as I learnt now, many Java programs fail due to this reason! :-)

   I just renamed the path and it works fine now :-)

   ---

   P.S.

   Thank you @gabriele-mariotti for the gradlew clean suggestion. In fact, that helped me find the real root cause. I was not able to run gradlew from the terminal due to a RuntimeException:

   Could not determine wrapper version. at org.gradle.wrapper.GradleWrapperMain.wrapperVersion
   

   But that helped me learn about the effect of '!' symbol on paths, and to the root cause of the problem. Thank you all!

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